body {
    background-image: url(../img/bg.jpg);
    background-size: 100%;
    background-repeat: no-repeat;
    font-family: 方正喵呜体;
}
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-weight: 300;
}

body ::-webkit-input-placeholder {
    /* WebKit browsers */
    font-family: 方正喵呜体;
    color: #53e3a6;
    font-weight: 300;
}
body :-moz-placeholder {
    /* Mozilla Firefox 4 to 18 */
    font-family: 方正喵呜体;
    color: #53e3a6;
    opacity: 1;
    font-weight: 300;
}
body ::-moz-placeholder {
    /* Mozilla Firefox 19+ */
    font-family: 方正喵呜体;
    color: #53e3a6;
    opacity: 1;
    font-weight: 300;
}
body :-ms-input-placeholder {
    /* Internet Explorer 10+ */
    font-family: 方正喵呜体;
    color: #53e3a6;
    font-weight: 300;
}
div {
    margin: 100px auto;
    width: 600px;
    height: 410px;
}

form {
    padding: 20px 0;
    position: relative;
    z-index: 2;
}

form input {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    outline: 0;
    border: 1px solid rgba(255, 255, 255, 0.4);
    background-color: rgba(255, 255, 255, 0.2);
    width: 250px;
    border-radius: 3px;
    padding: 10px 15px;
    margin: 0 auto 10px auto;
    display: block;
    text-align: center;
    font-size: 18px;
    color: #53e3a6;
    -webkit-transition-duration: 0.25s;
    transition-duration: 0.25s;
    font-weight: 300;
}
form input:hover {
    background-color: rgba(255, 255, 255, 0.4);
}
form input:focus {
    background-color: white;
    width: 300px;
    color: #53e3a6;
}
#button {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    outline: 0;
    background-color: white;
    border: 0;
    padding: 10px 15px;
    color: #53e3a6;
    border-radius: 3px;
    width: 250px;
    cursor: pointer;
    font-size: 18px;
    -webkit-transition-duration: 0.25s;
    transition-duration: 0.25s;
    font-family: 方正喵呜体;
}

form input:hover {
    background-color: rgba(255, 255, 255, 0.4);
}
form input:focus {
    background-color: white;
    width: 300px;
    color: #53e3a6;
}

#button:hover {
    background-color: #f5f7f9;
}

p {
    text-align: center;
    color: #50a3a2;
    font-size: 21px;
}